Effect of Channel Width Ratio on the Billet Deformation during Lateral Extrusion

Effective strain distribution, load and velocity field were analyzed by rigid-plastic finite element method for different channel width ratio. The results show that the large plastic deformation region is transferred from top surface to bottom surface with increasing the channel width ratio. When it increases to 2, the emergence of dead zone leads to the severe plastic deformation along the bottom surface of the billet. With the decrease of channel width ratio, the fraction of more uniform deformation region along the cross-section of the deformed billet decreases, while the corner gap between the billet and the die increases. The obvious distortion occurs when the channel width ratio decreases to 0.67. The peak extrusion load increases with the increase of channel width ratio.